Eu<3+>-activated barium strontium fluoborate red fluorescent powder, preparation and application thereof

Abstract

The invention discloses Eu<3+>-activated barium strontium fluoborate red fluorescent powder as well as preparation and application thereof. The general chemical formula of the fluorescent powder is Ba<3-x>Eu<x>Sr2B4O10F2, wherein x is the substitution molar ratio of Eu<3+> to Ba<2+>, and x is greater than or equal to 0.005 and less than or equal to 0.35. The method comprises the following steps: (1) preparing fluorine-free barium strontium borate precursor powder Ba<2-x>EuxSr2B4O10 by using a chemical sol-gel method; and (2) adding barium fluoride and ammonium fluoride into the prepared fluorine-free barium strontium borate precursor powder, fully mixing all the components, tabletting the mixture, and then preparing the Eu<3+>-activated barium strontium fluoborate red luminescent fluorescent powder Ba<3-x>Eu<x>Sr2B4O10F2 through solid-phase sintering. The red fluorescent powder is in a pure phase and uniform in particle, can emit red light with the central wavelength of 615 nanometersunder excitation of near ultraviolet light 395 nanometers, and is high in luminous intensity and good in thermal stability; therefore, the red fluorescent powder can be used for preparing an illumination or display device taking near ultraviolet light as an excitation light source.

Description

technical field [0001] The invention relates to the field of inorganic fluorescent materials and display technology, in particular to a Eu 3+ Activated strontium barium fluoroborate red phosphor and its preparation and application. Background technique [0002] In recent years, based on the innovation and development of semiconductors, blue and near-ultraviolet semiconductor chips have been applied, and lighting and display have been revolutionized. White light-emitting diodes based on rare earth ion-activated phosphors have achieved solid-state lighting, forming the current Compared with traditional fluorescent lamps, energy-saving lighting and other light sources, mainstream commercialized white LED lighting devices, the rapidly developing new generation of lighting based on LED chips has many advantages of environmental protection, low power consumption, safety and high brightness. [0003] Today's most important lighting is made of blue semiconductor chips and yellow Y ...

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Problems solved by technology

[0003] Today's most important lighting is made of blue semiconductor chips and yellow Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) Phosphor powder combined package, this kind of lighting has many advantages, but this kind of lighting also has inevitable disadvantages: insufficient red light emission in lighting luminescence, color temperature (CCT>4500K) and color rendering index (Ra<80 ) is poor, these shortcomings largely limit its application in general lighting

[0004] At present, the commercial red phosphor powder for LED is mainly Y 2 o 2 S:Eu 3+ , the red fluorescent powder is a sulfide, because sulfide is used as a raw material in the preparation process, and it needs to be calcined under a protective atmosphere or a reducing atmosphere to prevent sulfur from reacting with oxygen in the air. The preparation method is very complicated; sulfide The system efficiency is low, the chemical stability is poor, and it is easy to generate H 2 S gas corrodes LED chips

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